PRECAUTIONS: See also Side Effects section.Before taking tetracycline, tell your doctor or pharmacist if you are allergic to it; or to other tetracyclines (e.g., doxycycline, minocycline), or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems.
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Cassiterite is a tin ore. While used mostly in tin production, fine specimens of the black rocks are also used as ornaments. The black gemstones are usually opaque, but can be translucent when found in thin crystals. The black stones have a metallic luster that makes them desirable for jewelry.lso known as fluorspars, fluorites are fluorescent (an adjective derived from its name) stones that come in virtually all colors, including red, yellow, green and black. The black gemstones are less common. The black stones, like all fluorites, are rather soft, and hence not widely used in jewelry.